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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833620eae1e442234c2cd539a187ebee8839620ba7123b63feb33de97b574d59' 
  AND token = 'FFvzsoyYxLUmA7h7n9Nem+g40FVd6qTOgEIABJ15nwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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