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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc94e2ab2466b9550cee0adffadc167d1ebb587682b1d5512710a7635d39e97c' 
  AND token = 'xw+E+lIFWyTelPY9eTg7U8189oUZaM0eyKsMMxV6UWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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