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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2219f355ff1afd72f0b9299960d1c8c4cf60b1041b1850cde964a737f79633dc' 
  AND token = 'O0SSQgD3amXTd0JBB3DK83ZMGcvYJhusNCqTdfkNUJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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