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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23626806ff197dcef138929f64244f0d3ec40991292e3984fdc2b3b0eb51882' 
  AND token = 'FcWntZtvy/nQntnwelJyFwul9giJjIRgNOZy1Hh4COk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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