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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb8ee63d79725fdde455cb5b0726a8aa279f71d6118aa3df3fafa862e6afdea4' 
  AND token = 'mg5uIZZQsUCEN3MHWGNXRNrLV0b8FG7lmh2iC5KfhpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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