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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be6b409e19c339f82c24b9acd9558f53895ccc3c893f9cbba2a4e16ec7e9fdc' 
  AND token = 'BrenPs+gaop+KXNsWuBVq4M0BOvj8N+131hBz+muxZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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