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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b706db85f2b7197333b46769725a1de54f599fe8e735595810371a099da2ed8a' 
  AND token = '18HpufX40LgzzvrzgfJd59ez9ZMCY+6RMQjI09H+2zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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