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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecbd987445b0872ef140fef6ee92d1e13fbd7be347c5a5123a780ecb7392dbcc' 
  AND token = 'uI1kB9br2o6GNFJRGac4BClQ4IJjLA6qI2a+58PbliE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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