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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4764e3974d2fb84969d474441dffaad143e416c769f6a7575c4ddc6ff35a9c7' 
  AND token = 'yuYy+F3LIjwYKa0GtQb1rbZxucdIiSeJHIJGDmZ0KJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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