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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc58e73e98b3efd479ca861ef3bba88f09d3513766d98f55b200d0ad8d434215' 
  AND token = 'EES/P+qFLtfFKSwjNNu8Tym5kACBdnDVLctUwbJM6ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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