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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ad5dd554c3838ce211c1133c518919ab0fa11246e9295fcba824a311c8e90d' 
  AND token = '92yVtLICGDdIPjcYCHjiHFP0m35E8vJP15N0ZhpmWQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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