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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c3f086e48e7154303ad59d2e2afa64f4c641e6136328352d184cfaf081e6ae' 
  AND token = 'C/cnP2ARturkdYdA9XVYAcmFUS/Iyc17tIF429ayAuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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