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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d1dc8b14ad5979d5e3a029e1422d6ad81be559e52f8111c6df669423ce728f0' 
  AND token = '0ilNt1rjEq96pUqgNeKOlSSymYUJ7S5bzW8DFq25pGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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