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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0455c3454850a8574d297e4d67c4a37d42d242585b846e5f3424b3617b52f915' 
  AND token = 'BdZbgm8FH8pZjg1qNtW8Vr6KT12SI6/I5p4bSPkBvCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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