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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '014f6b2cfd295776e70fbbd5cbb9e11db3b37ab45bcd3736940df8a45d55fbd3' 
  AND token = '9bFnAC8bFLbXZzTuOexUhT+UDObf2Z4QDAW6RFIdiks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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