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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55174be6b286cf4fcfeea48db0c4e96fe93d6c196e6b66a330e2e74b3529f7ed' 
  AND token = 'Oe7e4mrXlC3OdtXhjHqxbfkEzPWs3TCr1iBiosSHHbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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