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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babec763fab236593f4f49cba6ac7b65d55c4e55f35ee3322b3d3033727676e4' 
  AND token = 'RgLlfvu57zfB43zErikfxMTebX46JBvOjlKWsPV/Z7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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