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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e69ab9fa947f4632444c7369de93275466bdd97247fde6f4c4d3b4d945324cd' 
  AND token = 'CUuIkMJZb+9iY84bMx9GTkvETo/HB2A/oN88r1HTx7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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