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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611d19b27f21b358bf4ebcb7e92fa81977d1fd4fac0a0e7323cc0cc8adef9d8f' 
  AND token = 'BNozINRTn1y8AYigMSe6iusur9no7JAUJzz5WGrufmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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