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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf110b3637b56236b2d8fa767b99e7b162eb5d7dae7f676429944e8513e3a098' 
  AND token = '9j9oBpj5Fio7cCkJS44KaQ936pqvj5E0qLrqO2mvaTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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