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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd21286d2b9d265cf37483ce02d6d8f831642e3c56ca3a0cc278a1b3a843bbe' 
  AND token = 'OjxxQf16Hxj02yzPW/IJzVaM8xXXBQMU/O6XWzHb62Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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