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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070254acc422fe7fdce7a2c04b447e3eb97433b279eb807767cef1fa639603c1' 
  AND token = 'PMaX4iuY+d9OMjdWA6+Ie6yi+qhln8MqSpriRAC1+e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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