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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d85b9956f82e96023bb950848937d47b5fd2ce1c2cc18426e2266861f65079f' 
  AND token = 'AJmuxylFZD9lOyCc3TERx02Xxa97Np4w+jM1n+WhR7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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