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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad472d1c8481da976cbc9d02a1d1d502248a7fe1a7476fb4e8a28bb74a7a8c2b' 
  AND token = 'IGtngxVwKwEmShPqsT8N1ydbD8R2Mn+7Ib3JTZz4EuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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