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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75dbb8b65d6dce8a4f95c85d743da62034abbf26dc513b72b0283515e74d6e3c' 
  AND token = 'F0n1smVXT22RtCogXyPGSOkMssMcHyQmtH6sh9P7izY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}