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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46fa8fd1aa1c7934c118e984ed6805f46fc877b8d4ee09b8979f10386148efd8' 
  AND token = 'Z/50GlV5JHNZK9omFzmrZj87VLpknzwlN+4me0abKo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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