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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860d1b0846ac1b76fe333dbf9d89420e70fe1c9d9d3b8540fa02672b8a6a844c' 
  AND token = 'l/Ma4jfP+8nVLnU/nntKfcmNXnFY64zeSTnNiGGEyLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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