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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63a7522cb5dd4136706447a1afdf891e2adcf9943dd5c15355d11371ebe1cb1' 
  AND token = 'TyOHv7ux0Q8OO6twVuAoojD7ZE/7BtXCsBd8oZV5yAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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