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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '208f9e322006d450f4fbf1d6ed22cb2914a8018b5cb084eaaeb0bbd311e06f30' 
  AND token = '+LP4CxLRIupfGZ2n8Hag0KQPvg6ImmP6K3jVoGPxtZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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