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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '212d49996e720b48e805ada2151bf919609b20447cd7eaf0b94ee02b4ec328d4' 
  AND token = '+PCTVrkZ7cLORlD5Xf3kFj/uHQWgmCUoV72tWu1SSM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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