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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbbe90522e6eb29b63ee032c2e1ee1295562babc0dde2143dc7fd54bf89269be' 
  AND token = '/WjWkbIBXw6QK6BWv8OuHccopX6H13lYcMKSIerXWX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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