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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a20681d93a4fbb2fa4e2108598f6993c307ea4ed71ce2e6b36303b0a740dbc3' 
  AND token = '4t0CSCMiL82iZ6qV9U2wJY+zuSQWrIoLBfPI30E2BFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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