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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c865401c96219a774fbd38d814c7add19d5291a2eb3ee149257bc4530384c80' 
  AND token = 'k23i8Bhn53H5qoqanqFXK4BjqvLEMHeexs6Z/VKZ0NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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