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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '707bd642e3044f9f99ec9aa5005c6b393b4747adecfd2260dcb1b6f47ac5b962' 
  AND token = 'NwuAartM2rJDQEekY1QGXuetuU/pedO6nIiQL0p7jvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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