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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ed644eb5ac6eab5c901cf28e09bc7f90955185d3b3fa54f7096ae8a3cdef2b8' 
  AND token = '1I88UMfwCqk8dzWcjqCLwZKdhj88otvSZUqT36MFqM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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