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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688ed99b3d8d86aa6002db4f898c0e13d56755d07fef23d155e3e82db985aa8e' 
  AND token = 'DNOMI4kuFYn0Vu2CTVJgBqBsR1SsPBTM5E/Rxz+htv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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