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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62aaf7accb008e0b2b2b0eb66970726eb01d414dcc46bad6440d480e16ce53da' 
  AND token = 'wQj1uQaZhOnwaObz8ZpZdKKRBAaz3xm64cn808s9DNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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