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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2495457d7aa4452b74662fd01067a5d88822dd9fc2a6215827b1bc1a9409ae73' 
  AND token = 'vSBX07zbnPdA+SD/9kLnt2N1Q8cYA8yscr5QBsvWIGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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