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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6fa7a6a1ee876e7baeec0a7657e5f24dad3d5859b6ea5438bcec56f03438a47' 
  AND token = '2MJ0nv/uWROXM6YdT/9jqqBAuv0N5rw+nZxx7zInddQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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