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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '579657ec3b32c9e92a2ac78b3281b96e811907ed07368c1a69e40926b7a166c3' 
  AND token = 'uxIGrjhuNKUfbiwTZIWdCoElGn6RkGMbHJGGkkiahco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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