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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '834020d5c75f6c489ee529fd811aea0cef5a5808bf2e7763df730086fcf8db6b' 
  AND token = 'lwCR1e9yzdGt1PcL2e7Rhm5KC/icyb4U4NzJxTD7pcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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