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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3041ee91ac91bd0782517d76796df877853c488827bb191b42cc05d6098cfec7' 
  AND token = '5OO0fHely+dCaYt5ABqaV5/o9g0NpgK9tJat8HrwMr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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