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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eff5b9558fbe7a8168c7955cbbd2d0761b3637c50188d83b62a84f1279ea9d8' 
  AND token = '+zz3F1T2HBqXpkDWnof3Xkto2UDAiEUVL3+T2EO/p/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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