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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '628bcd0e08e43fd731054765c566c8123d5758db31923a8662726c74d57d4d03' 
  AND token = 'S/y57VX64sLAccHyR2TDoe2A9I/WB+oOsGphe4CCoHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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