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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea67612e05b997331c28ce250c65ff1c3b90c6d419def3bbac5449cec194c51' 
  AND token = '/L2dfnj7F6bUEl1gkJSRvfIuE/C1Qem4JsyA9RUoecg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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