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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68dcff662db7fd7b72c60d81d261e158c28d7a4b334f9846cf4a13d38dfaa7d6' 
  AND token = 'BXRKHD2b3RdFekbqNICCNSQereCpE5Iv4Q9ebVI3CHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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