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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff62a73822464a260ed2b6ffeaf49d0f4eeee8fa3c9764c75513b9eeb40b5ced' 
  AND token = 'utbAo8Y1SlGN6IH4royDfzI+MAI0zo+V4yCbz3cAcCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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