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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2576b8435b8a9189e08b9dfb7ba07ad9d5252ba73d4d82cd729600e1d5afae1d' 
  AND token = 'LXiPpESwZkr2tIieCEXI+S02/K4wfhuUr7lRlSHQtE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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