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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b78fc178c6239fbd23a2ccbd2fd7c624d591bd270e780a8df788b8c428af6f' 
  AND token = 'xcHawCL5keIDhrtSEu33BN3EVNeuol/SbtWxWbRvXX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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