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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44ccdfb710d58d73e5be5c3b716071d14fd79e11f0fab3294aeb4c635652e861' 
  AND token = 'W53sbLGjTfKOhQ4YyxSrFT7fo2cU2SeaRccqiiUDqqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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