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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '389691d0cebd7ac0669895adb1af0ce21702314254ff171e6809ed97c9451e12' 
  AND token = 'wMEEw9MrC1BCRoHZ5Go9wOVSTrKBIwRptS4mOiSx4uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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