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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90929c44df643d4a3b3a92a2eb66de552fce7b5a4f06eab773e2135936f269a7' 
  AND token = 'Dd8gUroD8RgLe6UAk7n4XAoOhDOZ45evJzkwJTrwUqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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