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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58fae0822fb1b30e6cd86e6f6a2451177447f7d68c29730caf28eb9f390218bb' 
  AND token = 'uS2TnLr6G87NiHD7TtKE4fAoSvgBWoGZRJQL5U5Qjog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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