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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '728f2b828a34ec9c91c71c9d0da71fdec723d54c9e074f78e1539216a897804c' 
  AND token = 'EIEgSjfGLJ8ERbMP/9G/0zEJwX0VT3O6ws/bcXDEU6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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