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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb56981566e25a7c35b2e4d10efb38417c448dccbb786b65d6e669ca761c652f' 
  AND token = 'PZkYvFiZzt54ycGgBZ3eQe7Ii5y2pbEeXmdtq/1EcOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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