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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ebaa9876f74951b2054b3b93ae95d369ed80cd0db9bcec92d837a30e649580' 
  AND token = 'U4VSH/PVl38YjDFCs/oYjjjOXLPNkQpdndbTqnZ++g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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