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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f9f6477185d55f63448b4b8218ecc2143c5f5cad27a1f972fc9d42c29502588' 
  AND token = 'mg/1x2+dmMCFbWLu+tSOlvfXtPA3duLSHJofZCGgSWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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