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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '971046b649324061848ef755f4a049d54df7c1e1b172a07a5139fd506197ee8d' 
  AND token = 'd5cXQj+NTPJcgxZWYJ4EXq3PQ+JWvtP6dX/iQhTyRuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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