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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c354f53591adde99f6e19c4871084e4ea44de0fba87a2dfb37c94980af3610' 
  AND token = 'BF9/KNr0ThehBxkTGunbCd4VxvYeNYN7yeDmvvWu9Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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