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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02d04768f6672ab55a0f9d5d69c5a8e48b6685db8101c31bd19a06985d7022a' 
  AND token = 'T60nHEeV6+idjVWsJZ8t44aWfFnQ4IVI1FkOqdCaJyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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