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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c1cd090cfd1372fd4aa872cecce9898b50fba080b121361cbf368e8a1921c93' 
  AND token = 'NewbpJY+wyb2Bv9h8xGP6PYp3Xhl29Z6PWepGg18eHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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