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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5072b1c0235aa927d0ef6ab7252dfff852de7e508f9cce7b9185337b06e94770' 
  AND token = 'dmjPVnSRbp/TmSSpNUfO/qg63ubSOIjfubw4fUSy/6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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